The Doctor returns to the past where he must confront the alien warlord who is turning innocent victims into transmitters — only to learn that the Doctor himself may have to die. In the future, Clara and the other survivors of the underwater outpost struggle to survive when it looks like there may be no way out.
U.S. air dates are in MM.DD.YY form. U.K. air dates are in DD.MM.YY form.
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